Desenvolvimento e aplicação de metodologias de ciência de dados para análise de performance de medidores de vazão multifásicos por dados de vaso separador
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Data
2025-12-19
Autores
Lacourt, Gustavo Grecco
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Universidade Federal do Espírito Santo
Resumo
The oil industry is characterized by multiphase flows typically involving oil, gas, and water, which are separated on production platforms by separator vessels, enabling the individual measurement of each phase’s flow rate. Due to the size, weight, and cost of these vessels, there is increasing interest in the use of multiphase flow meters (MPFMs) as alternatives for field testing. This dissertation applies a calibration and validation methodology for MPFMs based on reference data obtained from single phase meters positioned downstream of separator vessels. The methodology combines calibration factors with time-series analysis techniques, including stationarity tests (ADF and KPSS), autocorrelation (ACF) and partial autocorrelation (PACF) functions, and cross-correlation (CCF). These tools enable the investigation of temporal coherence between signals and the identification of physical delays arising from the layout of the instruments in the plant. Data from 27 tests conducted in two campaigns, covering seven wells on a Brazilian offshore platform, were analyzed. The results showed that while MPFMs estimate total liquid flow with good accuracy, significant deviations occur in the measurement of individual phases, particularly oil. Calibration factors substantially reduced these deviations, as confirmed by the Mean Absolute Percentage Deviation (MAPD), which indicated average reductions from 58.36% to 8.74% for oil, from 10.46% to 1.69% for water, and from 29.36% to 24.92% for gas. Calibration factors also exhibited temporal stability, remaining valid in subsequent days, and calibration based on only four hours of data produced consistent factors, which is particularly relevant for compliance with resolutions defined by the Brazilian National Agency of Petroleum, Natural Gas and Biofuels (ANP). In addition, the Kruskal–Wallis test demonstrated the need for well-specific calibration rather than calibration solely by device. Cross correlation analysis revealed average physical delays of approximately 86 seconds between the MPFM and the separator, whose consideration contributed to additional improvements in the accuracy of gas measurements.
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Escoamento multifásico , Medidor multifásico , Vazão de óleo e gás